3
3.0
Jun 30, 2018
06/18
by
Nicolas F. Martin; Daniel R. Weisz; Saundra M. Albers; Edouard Bernard; Michelle L. M. Collins; Andrew E. Dolphin; Annette M. N. Ferguson; Rodrigo A. Ibata; Geraint F. Lewis; A. Dougal Mackey; Alan McConnachie; R. Michael Rich; Evan D. Skillman
texts
eye 3
favorite 0
comment 0
We present homogeneous, sub-horizontal branch photometry of twenty dwarf spheroidal satellite galaxies of M31 observed with the Hubble Space Telescope. Combining our new data for sixteen systems with archival data in the same filters for another four, we show that Andromeda dwarf spheroidal galaxies favor strikingly red horizontal branches or red clumps down to ~10^{4.2} Lsun (M_V ~ -5.8). The age-sensitivity of horizontal branch stars implies that a large fraction of the M31 dwarf galaxies...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1704.01586
Sermon at Rehobeth UMC, Terrell, NC James 2:1-10, 14-17 Faith and Works Michael Rich, pastor
Topics: James, Faith and Works
51
51
Sep 22, 2013
09/13
by
Michelle L. M. Collins; Scott C. Chapman; R. Michael Rich; Rodrigo A. Ibata; Nicolas F. Martin; Michael J. Irwin; Nicholas F. Bate; Geraint F. Lewis; Jorge Peñarrubia; Nobuo Arimoto; Caitlin M. Casey; Annette M. N. Ferguson; Andreas Koch; Alan W. McConnachie; Nial Tanvir
texts
eye 51
favorite 0
comment 0
We present a homogeneous kinematic analysis of red giant branch stars within 18 of the 28 Andromeda dwarf spheroidal (dSph) galaxies, obtained using the Keck I LRIS and Keck II DEIMOS spectrographs. Based on their g-i colors (taken with the CFHT MegaCam imager), physical positions on the sky, and radial velocities, we assign probabilities of dSph membership to each observed star. Using this information, the velocity dispersions, central masses and central densities of the dark matter halos are...
Source: http://arxiv.org/abs/1302.6590v1
52
52
Sep 22, 2013
09/13
by
Silvia K. Ballero; Francesca Matteucci; Livia Origlia; R. Michael Rich
texts
eye 52
favorite 0
comment 0
We compute the chemical evolution of the Galactic bulge in the context of an inside-out model for the formation of the Milky Way. The model contains updated stellar yields from massive stars. The main purpose of the paper is to compare the predictions of this model with new observations of chemical abundance ratios and metallicity distributions in order to put constraints on the formation and evolution of the bulge. We computed the evolution of several alpha-elements and Fe and performed...
Source: http://arxiv.org/abs/astro-ph/0702137v1
50
50
Sep 22, 2013
09/13
by
Samir Salim; R. Michael Rich
texts
eye 50
favorite 0
comment 0
In recent years argument has been made that a high fraction of early-type galaxies in the local universe experience low levels ( < 1 M_sun/yr) of star formation (SF) that causes strong excess in UV flux, yet leaves the optical colors red. Many of these studies were based on GALEX imaging of SDSS galaxies (z~0.1), and were thus limited by its 5" FWHM. Poor UV resolution left other possibilities for UV excess open, such as the old populations or an AGN. Here we study high-resolution...
Source: http://arxiv.org/abs/1004.2041v1
91
91
Jul 19, 2013
07/13
by
Juntai Shen; R. Michael Rich; John Kormendy; Christian D. Howard; Roberto De Propris; Andrea Kunder
texts
eye 91
favorite 0
comment 0
Bulges are commonly believed to form in the dynamical violence of galaxy collisions and mergers. Here we model the stellar kinematics of the Bulge Radial Velocity Assay (BRAVA), and find no sign that the Milky Way contains a classical bulge formed by scrambling pre-existing disks of stars in major mergers. Rather, the bulge appears to be a bar, seen somewhat end-on, as hinted from its asymmetric boxy shape. We construct a simple but realistic N-body model of the Galaxy that self-consistently...
Source: http://arxiv.org/abs/1005.0385v2
123
123
Jul 20, 2013
07/13
by
Weidong Li; Alexei V. Filippenko; Elinor Gates; Ryan Chornock; Avishay Gal-Yam; Eran O. Ofek; Douglas C. Leonard; Maryam Modjaz; R. Michael Rich; Adam G. Riess; Richard R. Treffers
texts
eye 123
favorite 0
comment 0
We present extensive photometric and spectroscopic observations of the Type Ia supernova (SN Ia) 2000cx in the S0 galaxy NGC 524, which reveal it to be peculiar. Photometrically, SN 2000cx is different from all known SNe Ia, and its light curves cannot be fit well by the fitting techniques currently available. There is an apparent asymmetry in the $B$-band peak, in which the premaximum brightening is relatively fast (similar to that of the normal SN 1994D), but the postmaximum decline is...
Source: http://arxiv.org/abs/astro-ph/0107318v1
30
30
Sep 19, 2013
09/13
by
Richard D. Robinson; Jonathan M. Wheatley; Barry Y. Welsh; Karl Forster; Patrick Morrissey; Mark Seibert; R. Michael Rich; Samir Salim; Tom A. Barlow; Luciana Bianchi; Yong-Ik Byun; Jose Donas; Peter G. Friedman; Timothy M. Heckman; Patrick N. Jelinsky; Young-Wook Lee; Barry F. Madore; Roger F. Malina; D. Christopher Martin; Bruno Milliard; Susan G. Neff; David Schiminovich; Oswald H. W. Siegmund; Todd Small; Alex S. Szalay; Ted K. Wyder
texts
eye 30
favorite 0
comment 0
The Galaxy Evolution Explorer (GALEX) satellite has obtained high time resolution ultraviolet photometry during a large flare on the M4 dwarf star GJ 3685A. Simultaneous NUV (1750 - 2800A) and FUV (1350 - 1750A) time-tagged photometry with time resolution better than 0.1 s shows that the overall brightness in the FUV band increased by a factor of 1000 in 200 s. Under the assumption that the NUV emission is mostly due to a stellar continuum, and that the FUV flux is shared equally between...
Source: http://arxiv.org/abs/astro-ph/0507396v1
3
3.0
Jun 30, 2018
06/18
by
Andreas Koch; R. Michael Rich
texts
eye 3
favorite 0
comment 0
We present a chemical abundance study of the brightest confirmed member star of the ultrafaint dwarf galaxy Bootes II from Keck/HIRES high-resolution spectroscopy at moderate signal-to-noise ratios. At [Fe/H] = -2.93 +/- 0.03 (stat.) +/- 0.17 (sys.) this star chemically resembles metal-poor halo field stars and the signatures of other faint dwarf spheroidal galaxies at the same metallicities in that it shows enhanced [alpha/Fe] ratios, Solar Fe-peak element abundances, and low upper limits on...
Topics: Astrophysics of Galaxies, Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1408.3628
2
2.0
Jun 29, 2018
06/18
by
Nicolas F. Martin; Rodrigo A. Ibata; Geraint F. Lewis; Alan McConnachie; Arif Babul; Nicholas F. Bate; Edouard Bernard; Scott C. Chapman; Michelle M. L. Collins; Anthony R. Conn; Denija Crnojević; Mark A. Fardal; Annette M. N. Ferguson; Michael Irwin; A. Dougal Mackey; Brendan McMonigal; Julio F. Navarro; R. Michael Rich
texts
eye 2
favorite 0
comment 0
We present a comprehensive analysis of the structural properties and luminosities of the 23 dwarf spheroidal galaxies that fall within the footprint of the Pan-Andromeda Archaeological Survey (PAndAS). These dwarf galaxies represent the large majority of Andromeda's known satellite dwarf galaxies and cover a wide range in luminosity ($-11.6
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1610.01158
45
45
Sep 18, 2013
09/13
by
Jean-Michel Deharveng; Todd Small; Tom A. Barlow; Celine Peroux; Bruno Milliard; Peter G. Friedman; D. Christopher Martin; Patrick Morrissey; David Schiminovich; Karl Forster; Mark Seibert; Ted K. Wyder; Luciana Bianchi; Jose Donas; Timothy M. Heckman; Young-Wook Lee; Barry F. Madore; Susan G. Neff; R. Michael Rich; Alex S. Szalay; Barry Y. Welsh; Sukyoung K. Yi
texts
eye 45
favorite 0
comment 0
The GALEX (Galaxy Evolution Explorer) spectroscopic survey mode, with a resolution of about 8 A in the FUV (1350 - 1750 A) and about 20 A in the NUV (1950 - 2750 A) is used for a systematic search of Ly-a emitting galaxies at low redshift. This aims at filling a gap between high-redshift surveys and a small set of objects studied in detail in the nearby universe. A blind search of 7018 spectra extracted in 5 deep exposures (5.65 sq.deg) has resulted in 96 Ly-a emitting galaxy candidates in the...
Source: http://arxiv.org/abs/0803.1924v1
3
3.0
Jun 28, 2018
06/18
by
Nicolas F. Martin; Rodrigo A. Ibata; Michelle L. M. Collins; R. Michael Rich; Eric F. Bell; Annette M. N. Ferguson; Benjamin P. M. Laevens; Hans-Walter Rix; Scott C. Chapman; Andreas Koch
texts
eye 3
favorite 0
comment 0
We present a study of the recently discovered compact stellar system Triangulum II. From observations conducted with the DEIMOS spectrograph on Keck II, we obtained spectra for 13 member stars that follow the CMD features of this very faint stellar system and include two bright red giant branch stars. Tri II has a very negative radial velocity (=-383.7^{+3.0}_{-3.3} km/s) that translates to ~ -264 km/s and confirms it is a Milky Way satellite. We show that, despite the small data set, there is...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1510.04433
2
2.0
Jun 29, 2018
06/18
by
Christian I. Johnson; Nelson Caldwell; R. Michael Rich; Catherine A. Pilachowski; Tiffany Hsyu
texts
eye 2
favorite 0
comment 0
We present radial velocities and chemical abundances for red giant branch stars in the Galactic bulge globular clusters NGC 6342 and NGC 6366. The velocities and abundances are based on measurements of high resolution (R > 20,000) spectra obtained with the MMT-Hectochelle and WIYN-Hydra spectrographs. We find that NGC 6342 has a heliocentric radial velocity of +112.5 km/s (sigma = 8.6 km/s), NGC 6366 has a heliocentric radial velocity of -122.3 km/s (sigma = 1.5 km/s), and that both clusters...
Topics: Astrophysics, Solar and Stellar Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1606.08491
5
5.0
Jun 29, 2018
06/18
by
R. Michael Rich; Noah Brosch; James Bullock; Andreas Burkert; Michelle Collins; Laura de Groot; Julia Kennefick; Andreas Koch; Francis Longstaff; Laura Sales
texts
eye 5
favorite 0
comment 0
We have used dedicated 0.7m telescopes in California and Israel to image the halos of ~200 galaxies in the Local Volume to 29 mag/sq arcsec, the sample mainly drawn from the 2MASS Large Galaxy Atlas (LGA). We supplement the LGA sample with dwarf galaxies and more distant giant ellipticals. Low surface brightness halos exceeding 50 kpc in diameter are found only in galaxies more luminous than L* and classic interaction signatures are relatively infrequent. Halo diameter is correlated with total...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1610.02775
41
41
Sep 21, 2009
09/09
by
*Credit:* Michael Rich, Kenneth Mighell, and James D. Neill (Columbia University), Wendy Freedman (OCIW) and NASA [ http://www.nasa.gov/ ]
image
eye 41
favorite 0
comment 0
*Description*: We believe our HST observations of NGC 4038/4039 and other merger galaxies also shed some new light on how young globular clusters form, i.e., from giant clouds of hydrogen gas that astronomers call Giant Molecular Clouds. Full-grown spiral galaxies like the Milky Way have typically 1000-2000 such clouds. An example is the GMC associated with the Eagle Nebula. Technical facts about this news release: Back to entire collection [...
Topics: M31, What -- Hubble Space Telescope (HST), Where -- NGC 4038
Source: http://hubblesite.org/newscenter/archive/releases/1997/34/image/t/
Sermon at Rehobeth UMC, Terrell, NC Acts 1:1-11 “Some Final Words” Michael Rich, pastor
Topics: Ascension, Acts 1
Sermon at Rehobeth UMC, Terrell, NC 1 Corinthians 12:12-31a Gifted Together Michael Rich, pastor
Topics: 1 Corinthians, Spiriutal Gifts
33
33
Sep 24, 2013
09/13
by
Andrea Kunder; Andreas Koch; R. Michael Rich; Roberto de Propris; Christian D. Howard; Scott A. Stubbs; Christian I. Johnson; Juntai Shen; Yougang Wang; Annie C. Robin; John Kormendy; Mario Soto; Peter Frinchaboy; David B. Reitzel; HongSheng Zhao; Livia Origlia
texts
eye 33
favorite 0
comment 0
We present new radial velocity measurements from the Bulge Radial Velocity Assay (BRAVA), a large scale spectroscopic survey of M-type giants in the Galactic bulge/bar region. The sample of ~4500 new radial velocities, mostly in the region -10 deg < l < +10 deg and b ~ -6 deg more than doubles the existent published data set. Our new data extend our rotation curve and velocity dispersion profile to +20 deg, which is ~2.8 kpc from the Galactic Center. The new data confirm the cylindrical...
Source: http://arxiv.org/abs/1112.1955v1
Sermon at Rehobeth UMC, Terrell, NC Revelation 21:1-6a I Believe in the Communion of Saints Michael Rich, pastor
Topics: All Saints, Revelation
40
40
Sep 22, 2013
09/13
by
David B. Reitzel; Puragra Guhathakurta; R. Michael Rich
texts
eye 40
favorite 0
comment 0
We present results from a Keck spectroscopic survey of red giants in a field near M31's major axis, ~34kpc in projection from the nucleus, near the globular cluster G1. We use multislit LRIS spectroscopy to measure the CaII triplet in 41 stars with apparent mags 20 =-0.8 for these potential M31 outer disk stars. Six of the 23 M31 members v and [Fe/H] values consistent with those of G1 (after accounting forits intrinsic spread in both): one of these stars lies within G1's projected tidal radius...
Source: http://arxiv.org/abs/astro-ph/0309295v3
40
40
Sep 21, 2013
09/13
by
Sebastien Lepine; Michael M. Shara; R. Michael Rich
texts
eye 40
favorite 0
comment 0
In an ongoing survey for high proper motion stars at low galactic latitudes, we have identified 5 previously uncatalogued common proper motion companions to stars listed in the Preliminary Version of the Third Catalogue of Nearby Stars (GJ stars). For each system, the relative proper motion between the components is less than 5% of the common proper motion of the pair. Spectra of the pairs have been obtained at the Lick 3-m Shane Telescope, confirming that the systems are indeed wide separation...
Source: http://arxiv.org/abs/astro-ph/0203162v1
Sermon at Faith United Methodist Church, Waynesville, NC- John 1:1-14-The Word Became Flesh and Blood and Moved In- Rev. Michael Rich, pastor
Topics: John 1, Christmas, Nativity
44
44
Sep 22, 2013
09/13
by
Sebastien Lepine; Michael M. Shara; R. Michael Rich; A. Wittenberg; M. Halmo; B. Bongiorno
texts
eye 44
favorite 0
comment 0
A new all-sky catalog of stars with proper motions pm>0.15"/yr is presented. The catalog is largely a product of the SUPERBLINK survey, a data-mining initiative in which the entire Digitized Sky Surveys are searched for moving stellar sources. Findings from earlier proper motions surveys are also incorporated. The new all-sky catalog supersedes the great historic proper motion catalogs assembled by W. J. Luyten (LHS, NLTT), and provides a virtually complete (>98%) census of high...
Source: http://arxiv.org/abs/0805.4736v2
Sermon at Rehobeth UMC, Terrell, NC Luke 9: 28-36 Transfigured Michael Rich, pastor
Topic: Transfiguration
15
15
Jun 27, 2018
06/18
by
Yujing Qin; Juntai Shen; Zhao-Yu Li; Shude Mao; Martin C. Smith; R. Michael Rich; Andrea Kunder; Chao Liu
texts
eye 15
favorite 0
comment 0
We explore the kinematics (both the radial velocity and the proper motion) of the vertical X-shaped feature in the Milky Way with an N-body bar/bulge model. From the solar perspective, the distance distribution of particles is double-peaked in fields passing through the X-shape. The separation and amplitude ratio between the two peaks qualitatively match the observed trends towards the Galactic bulge. We confirm clear signatures of cylindrical rotation in the pattern of mean radial velocity...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1503.06774
76
76
Sep 18, 2013
09/13
by
R. Michael Rich; David B. Reitzel; Christian D. Howard; HongSheng Zhao
texts
eye 76
favorite 0
comment 0
We are undertaking a large scale radial velocity survey of the Galactic bulge which uses M giant stars selected from the 2MASS catalog as targets for the CTIO 4m Hydra multi-object spectrograph. The aim of this survey is to test dynamical models of the bulge and to quantify the importance, if any, of cold stellar streams in the bulge and its vicinity. Here we report on the kinematics of a strip of fields at -10 < l
Source: http://arxiv.org/abs/astro-ph/0611403v2
4
4.0
Jun 30, 2018
06/18
by
Nicolas F. Martin; Rodrigo A. Ibata; R. Michael Rich; Michelle L. M. Collins; Mark A. Fardal; Michael J. Irwin; Geraint F. Lewis; Alan W. McConnachie; Arif Babul; Nicholas F. Bate; Scott C. Chapman; Anthony R. Conn; Denija Crnojević; Annette M. N. Ferguson; A. Dougal Mackey; Julio F. Navarro; Jorge Peñarrubia; Nial T. Tanvir; David Valls-Gabaud
texts
eye 4
favorite 0
comment 0
We reveal the highly structured nature of the Milky Way stellar halo within the footprint of the PAndAS photometric survey from blue main sequence and main sequence turn-off stars. We map no fewer than five stellar structures within a heliocentric range of ~5 to 30 kpc. Some of these are known (the Monoceros Ring, the Pisces/Triangulum globular cluster stream), but we also uncover three well-defined stellar structures that could be, at least partly, responsible for the so-called...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1403.4945
44
44
Sep 21, 2013
09/13
by
Patrick Morrissey; Tim Conrow; Tom A. Barlow; Todd Small; Mark Seibert; Ted K. Wyder; Tamas Budavari; Stephane Arnouts; Peter G. Friedman; Karl Forster; D. Christopher Martin; Susan G. Neff; David Schiminovich; Luciana Bianchi; Jose Donas; Timothy M. Heckman; Young-Wook Lee; Barry F. Madore; Bruno Milliard; R. Michael Rich; Alex S. Szalay; Barry Y. Welsh; Sukyoung K. Yi
texts
eye 44
favorite 0
comment 0
We describe the calibration status and data products pertaining to the GR2 and GR3 data releases of the Galaxy Evolution Explorer (GALEX). These releases have identical pipeline calibrations that are significantly improved over the GR1 data release. GALEX continues to survey the sky in the Far Ultraviolet (FUV, ~154 nm) and Near Ultraviolet (NUV, ~232 nm) bands, providing simultaneous imaging with a pair of photon counting, microchannel plate, delay line readout detectors. These 1.25 degree...
Source: http://arxiv.org/abs/0706.0755v1
46
46
Sep 20, 2013
09/13
by
Andrew W. Stephens; Jay A. Frogel; D. L. DePoy; Wendy Freedman; Carme Gallart; Pascale Jablonka; Alvio Renzini; R. Michael Rich; Roger Davies
texts
eye 46
favorite 0
comment 0
In this paper we analyze the stellar populations present in M31 using nine sets of adjacent HST-NICMOS Camera 1 and 2 fields with galactocentric distances ranging from 2' to 20'. These infrared observations provide some of the highest spatial resolution measurements of M31 to date; our data place tight constraints on the maximum luminosities of stars in the bulge of M31. The tip of the red giant branch is clearly visible at Mbol ~ -3.8, and the tip of the asymptotic giant branch (AGB) extends...
Source: http://arxiv.org/abs/astro-ph/0301656v2
44
44
Sep 21, 2013
09/13
by
Benjamin D. Johnson; David Schiminovich; Mark Seibert; Marie Treyer; D. Christopher Martin; Tom A. Barlow; Karl Forster; Peter G. Friedman; Patrick Morrissey; Susan G. Neff; Todd Small; Ted K. Wyder; Luciana Bianchi; Jose Donas; Timothy M. Heckman; Young-Wook Lee; Barry F. Madore; Bruno Milliard; R. Michael Rich; Alex S. Szalay; Barry Y. Welsh; Sukyoung K. Yi
texts
eye 44
favorite 0
comment 0
The meaningful comparison of models of galaxy evolution to observations is critically dependent on the accurate treatment of dust attenuation. To investigate dust absorption and emission in galaxies we have assembled a sample of ~1000 galaxies with ultraviolet (UV) through infrared (IR) photometry from GALEX, SDSS, and Spitzer and optical spectroscopy from SDSS. The ratio of IR to UV emission (IRX) is used to constrain the dust attenuation in galaxies. We use the 4000A break as a robust and...
Source: http://arxiv.org/abs/0712.3573v1
50
50
Jul 19, 2013
07/13
by
Livia Origlia; Robert T. Rood; Sara Fabbri; Francesco R. Ferraro; Flavio Fusi Pecci; R. Michael Rich; Emanuele Dalessandro
texts
eye 50
favorite 0
comment 0
We present additional evidence that dust is really forming along the red giant branch (RGB) of 47 Tuc at luminosities ranging from above the horizontal branch to the RGB-tip (Origlia et al. 2007). The presence of dust had been inferred from an infrared excess in the (K-8) color, with K measured from high spatial resolution ground based near-IR photometry and "8" referring to Spitzer-IRAC 8 micron photometry. We show how (K-8) is a far more sensitive diagnostic for detecting tiny...
Source: http://arxiv.org/abs/1005.4618v1
Sermon for Faith United Methodist Church, Waynesville, NC- Mark 13:24-37 -Keep Awake!-Rev. Michael Rich, pastor
Topics: Advent, Mark 13
50
50
Sep 21, 2013
09/13
by
Benjamin D. Johnson; David Schiminovich; Mark Seibert; Marie Treyer; D. Christopher Martin; Tom A. Barlow; Karl Forster; Peter G. Friedman; Patrick Morrissey; Susan G. Neff; Todd Small; Ted K. Wyder; Luciana Bianchi; Jose Donas; Timothy M. Heckman; Young-Wook Lee; Barry F. Madore; Bruno Milliard; R. Michael Rich; Alex S. Szalay; Barry Y. Welsh; Sukyoung K. Yi
texts
eye 50
favorite 0
comment 0
The color of galaxies is a fundamental property, easily measured, that constrains models of galaxies and their evolution. Dust attenuation and star formation history (SFH) are the dominant factors affecting the color of galaxies. Here we explore the empirical relation between SFH, attenuation, and color for a wide range of galaxies, including early types. These galaxies have been observed by GALEX, SDSS, and Spitzer, allowing the construction of measures of dust attenuation from the ratio of...
Source: http://arxiv.org/abs/0712.3051v1
Sermon at Rehobeth UMC, Terrell, NC 1 Kings 2:10-12; 3:3-14 Wisdom and Service Michael Rich, pastor
Topics: Solomon, Wisdom and Service
7
7.0
Jun 27, 2018
06/18
by
Maria Messineo; J. Simon Clark; Donald F. Figer; Rolf-Peter Kudritzki; Francisco Najarro; R. Michael Rich; Karl M. Menten; Valentin D. Ivanov; Elena Valenti; Christine Trombley; C. -H. Rosie Chen; Ben Davies
texts
eye 7
favorite 0
comment 0
Rich in HII regions, giant molecular clouds are natural laboratories to study massive stars and sequential star formation. The Galactic star forming complex W33 is located at l=~12.8deg and at a distance of 2.4 kpc, has a size of ~10 pc and a total mass of (~0.8 - ~8.0) X 10^5 Msun. The integrated radio and IR luminosity of W33 - when combined with the direct detection of methanol masers, the protostellar object W33A, and protocluster embedded within the radio source W33 main - mark the region...
Topics: Solar and Stellar Astrophysics, Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1505.02606
32
32
Jul 22, 2013
07/13
by
Christian D. Howard; R. Michael Rich; David B. Reitzel; Andreas Koch; Roberto De Propris; HongSheng Zhao
texts
eye 32
favorite 0
comment 0
Results from the Bulge Radial Velocity Assay (BRAVA) are presented. BRAVA uses M giant stars, selected from the 2MASS catalog to lie within a bound of reddening corrected color and luminosity, as targets for the Cerro Tololo Inter-American Observatory 4-m Hydra multi-object spectrograph. Three years of observations investigate the kinematics of the Galactic bulge major and minor axes with ~3300 radial velocities from 32 bulge fields and one disk field. We construct a longitude-velocity plot for...
Source: http://arxiv.org/abs/0807.3967v1
33
33
Sep 18, 2013
09/13
by
Ivo Saviane; Enrico V. Held; Valentin Ivanov; Danielle Alloin; Fabio Bresolin; R. Michael Rich; Luca Rizzi; Yazan Momany
texts
eye 33
favorite 0
comment 0
We report on the recent developments of our long-term investigation of the near-IR luminosity-metallicity relation for dwarf irregular galaxies in nearby groups. A very well-defined relation is emerging from our observational database, and a preliminary discussion of its implications is given.
Source: http://arxiv.org/abs/astro-ph/0505341v1
36
36
Sep 20, 2013
09/13
by
Jarrod R. Hurley; Michael M. Shara; Harvey B. Richer; Ivan R. King; D. Saul Davis; Jason S. Kalirai; Brad M. S. Hansen; Aaron Dotter; Jay Anderson; Gregory G. Fahlman; R. Michael Rich
texts
eye 36
favorite 0
comment 0
We present N-body models to complement deep imaging of the metal-poor core-collapsed cluster NGC6397 obtained with the Hubble Space Telescope. All simulations include stellar and binary evolution in-step with the stellar dynamics and account for the tidal field of the Galaxy. We focus on the results of a simulation that began with 100000 objects (stars and binaries), 5% primordial binaries and Population II metallicity. After 16 Gyr of evolution the model cluster has about 20% of the stars...
Source: http://arxiv.org/abs/0802.4127v1
8
8.0
Jun 28, 2018
06/18
by
Dan Maoz; Abraham Loeb; Yossi Shvartzvald; Monika Sitek; Michael Engel; Flavien Kiefer; Marcin Kiraga; Amir Levi; Tsevi Mazeh; Michal Pawlak; R. Michael Rich; Lev Tal-Or; Lukasz Wyrzykowski
texts
eye 8
favorite 0
comment 0
There are by now ten published detections of fast radio bursts (FRBs), single bright GHz-band millisecond pulses of unknown origin. Proposed explanations cover a broad range from exotic processes at cosmological distances to atmospheric and terrestrial sources. Loeb et al. have previously suggested that FRB sources could be nearby flare stars, and pointed out the presence of a W-UMa-type contact binary within the beam of one out of three FRB fields that they examined. Using time-domain optical...
Topics: High Energy Astrophysical Phenomena, Solar and Stellar Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1507.01002
2
2.0
Jun 30, 2018
06/18
by
Zhao-Yu Li; Juntai Shen; R. Michael Rich; Andrea Kunder; Shude Mao
texts
eye 2
favorite 0
comment 0
Recently the commissioning APOGEE observations of the Galactic bulge reported that a significant fraction of stars ($\sim10%$) are in a cold ($\sigma_{\rm V} \approx 30$ km/s) high velocity peak (Galactocentric radial velocity $\approx 200$ km/s). These stars are speculated to reflect the stellar orbits in the Galactic bar. In this study, we use two $N$-body models of the Milky Way-like disk galaxy with different bar strengths to critically examine this possibility. The general trends of the...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1401.2996
3
3.0
Jun 29, 2018
06/18
by
Yohei Miki; Masao Mori; R. Michael Rich
texts
eye 3
favorite 0
comment 0
To unveil a progenitor of the Andromeda Giant Stellar Stream, we investigate the interaction between an accreting satellite galaxy and the Andromeda Galaxy using an $N$-body simulation. A comprehensive parameter study with 247 models is performed by varying size and mass distribution of the progenitor dwarf galaxy. We show that the binding energy of the progenitor is the crucial parameter in reproducing the Andromeda Giant Stellar Stream and the shell-like structures surrounding the Andromeda...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1606.03173
Sermon for Faith United Methodist Church, Waynesville, NC- 2 Corinthians 4:13-5:1- A House Not Built with Hands- Rev. Michael Rich, pastor
Topics: Paul, Corinthians
Sermon for Faith United Methodist Church, Waynesville, NC- Matthew 5:13-20-Salt & Light- Rev. Michael Rich, pastor
Topics: Matthew, Sermon on the Mount
Sermon- Faith United Methodist Church August 21, 2016 14th Sunday after Pentecost Jeremiah 1:4-10 "You Are Known"
Topics: Jeremiah 1, Old Testament, Sermon
Sermon at Faith United Methodist Church, Waynesville, NC, Luke 14:25-33--Counting the Cost--Michael Rich, Pastor
Topics: Luke 14, Commitment, Counting the Cost
Sermon for Faith United Methodist Church, Waynesville, NC- Genesis 12:1-4 -Blessed to be a blessing- Rev. Michael Rich, pastor
Topics: Genesis, Abraham
Sermon for Faith United Methodist Church, Waynesville, NC- selections from Romans 8-What a Friend...(Memorial Service for Frances Harn) -Rev. Michael Rich, pastor
Topics: Romans 8, Memorial Service
Sermon at Faith United Methodist Church, Waynesville, NC- Luke 19:1-10-Zacchaeus, Another Look- Rev. Michael Rich, pastor
Topics: Luke 19, Zacchaeus
Sermon for Faith United Methodist Church, Waynesville, NC- Matthew 25:31-46 -Rev. Michael Rich, pastor
Topics: Christ the King, Matthew 25
Sermon for Faith United Methodist Church, Waynesville, NC- Matt. 18:21-35-70 x 7 and other higher math -Rev. Michael Rich, pastor
Topics: Matthew 18, forgiveness
